Wrong to keep people suffering (7)
I believe the answer is:
torment
'suffering' is the definition.
(torment is a kind of suffering)
'wrong to keep people' is the wordplay.
'wrong' becomes 'tort' (legal term).
'to keep' indicates putting letters inside.
'people' becomes 'men' (man is a kind of person).
'tort' enclosing 'men' is 'TORMENT'.
(Other definitions for torment that I've seen before include "Great agony" , "Cause great pain to" , "More TNT (anag.)" , "Tease unkindly" , "Persecute" .)